// Copyright 2010 Google Inc.
// 
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// 
//      http://www.apache.org/licenses/LICENSE-2.0
// 
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ------------------------------------------------------------------------

#include <pthread.h>

class Condition;


// A simple wrapper for Posix thread locking.


class SzlMutex {
 public:
  SzlMutex();
  void Lock();
  void Unlock();
  void AssertHeld() const;
  void AssertNotHeld() const;
  void LockWhen(const Condition &cond);
 private:
  pthread_mutex_t lock_;
};


class SzlMutexLock {
 public:
  SzlMutexLock(SzlMutex* mutex);
  ~SzlMutexLock();
 private:
  SzlMutex* mutex_;
};
